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OPERATING SEGMENT INFORMATION - Segment Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]        
Total Assets € 4,624 € 4,129    
Deferred income tax assets 162 193    
Cash and cash equivalents 147 439 € 184 € 164
Segment revenue        
Disclosure of operating segments [line items]        
Total Assets 4,245 3,440    
Segment revenue | P&ARP        
Disclosure of operating segments [line items]        
Total Assets 2,108 1,733    
Segment revenue | A&T        
Disclosure of operating segments [line items]        
Total Assets 948 765    
Segment revenue | AS&I        
Disclosure of operating segments [line items]        
Total Assets 738 668    
Segment revenue | H&C        
Disclosure of operating segments [line items]        
Total Assets 451 274    
Unallocated        
Disclosure of operating segments [line items]        
Deferred income tax assets 162 193    
Cash and cash equivalents 147 439    
Other financial assets € 70 € 57